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p 206
APPENDIX 2H
DOCUMENTATION
Chapter 2
Helical Foundation Systems
ESR-3074
|
Most Widely Accepted and Trusted
Page 2 of 9
external sleeve is identical to the FS288ES30 except that
the FS288ES48 is 48 inches (1219 mm) long.
The FS288C cap plate assembly is manufactured from
a
1
/
2
-inch-long (12.7 mm), 3
1
/
2
-inch-outside-diameter
(89 mm), 0.216-inch-nominal-wall-thickness steel pipe
that is factory-welded to a 1-inch-thick (25.4 mm), 5-inch-
wide (127 mm), 9-inch-long (229 mm) steel plate. The cap
plate is attached to the retrofit bracket with two
3
/
4
-inch-
diameter-by-16-inch-long (19.1 mm by 406 mm) threaded
rods, and matching
3
/
4
-inch (19.1 mm) heavy hex nuts.
(See Figure 1.)
3.2.2.2 New Construction Brackets HP288NCB and
HP288NCB8:
HP288NCB and HP288NCB8 brackets are
designed for embedment in cast-in-place concrete
foundations. The brackets are used to support axial
tensile and compressive loads that are concentric with the
longitudinal axis of the shaft. (See Figure 2.)
The HP288NCB bracket is manufactured from a
5.06-inch-long (128.5 mm), 3
1
/
2
-inch-outside-diameter
(89 mm), 0.250-inch-nominal-wall-thickness steel pipe
sleeve which is factory-welded to a
3
/
4
-inch-thick
(19.1 mm), 6-inch-square (152 mm) steel cap plate. The
bracket is attached to the shaft with two
3
/
4
-inch-diameter
(19.1 mm) standard hex threaded bolts and with matching
3
/
4
-inch (19.1 mm) standard hex jam nuts. (See Figure 2.)
The HP288NCB8 bracket is identical to the HP288NCB
bracket except that the HP288NCB8 cap plate is an
8-inch-square (203 mm) steel plate. (See Figure 2.)
3.3 Material Specifications:
3.3.1 Lead and Extension Shafts:
The leads and
extensions are carbon steel round structural tubes that
conform to ASTM A500, Grade B or C, having a minimum
yield strength of 60 ksi (413 MPa) and a minimum tensile
strength of 70 ksi (483 MPa). The shaft finish is either
plain steel or hot-dip galvanized in accordance with
ASTM A123.
3.3.2 Shaft Coupling:
3.3.2.1 Pipe Sleeves:
The sleeves are carbon steel
round structural tubing that conforms to ASTM A513,
Type 5, Drawn Over a Mandrel (DOM), Grade 1026,
having a minimum yield strength of 70 ksi (483 MPa) and
a minimum tensile strength of 80 ksi (552 MPa). The
sleeve finish is either plain steel or hot-dip galvanized in
accordance with ASTM A123.
3.3.2.2 Bolts and Nuts:
The steel coupling bolts are
3
/
4
–10 UNC 2A standard hex bolts conforming to SAE
J429, Grade 8, having a minimum yield strength of
130 ksi (896 MPa) and a minimum tensile strength of
150 ksi (1034 MPa). The matching steel nuts are
3
/
4
–10
UNC 2B standard hex jam nuts, conforming to SAE J995,
Grade 5. The bolts and nuts are zinc-coated in
accordance with ASTM B633, with coating classification
Fe/Zn 8.
3.3.3 Helix Plates:
The steel plates conform to ASTM
A572, Grade 50, having a minimum yield strength of
50 ksi (345 MPa) and a minimum tensile strength of
65 ksi (448 MPa). The helix finish is the same as that of
the shaft to which the helix is factory-welded.
3.3.4 Retrofit Bracket Assemblies FS288B and
FS288BL:
3.3.4.1 FS288B and FS288BL Brackets:
The steel
plates used in the brackets conform to ASTM A36, having
a minimum yield strength of 36 ksi (248 MPa) and a
minimum tensile strength of 58 ksi (400 MPa). The
bracket finish is either plain steel or hot-dip galvanized in
accordance with ASTM A123.
3.3.4.2 FS288ES30 and FS288ES48 Sleeves:
The
carbon steel structural round tubing, used for the 30-inch-
and 48-inch-long (762 mm and 1219 mm) sleeves,
conforms to ASTM A500, Grade B or C, having a
minimum yield strength of 50 ksi (345 MPa) and a
minimum tensile strength of 62 ksi (427 MPa). The
3
/
4
-inch-long (19.1 mm) steel ring (collar) conforms to
ASTM A53, Types E and S, Grade B, having a minimum
yield strength of 35 ksi (241 MPa) and a minimum tensile
strength of 60 ksi (413 MPa). The sleeve finish is either
plain steel or hot-dip galvanized in accordance with
ASTM A123.
3.3.4.3 FS288C Cap Plate Assembly:
The
1
/
2
-inch-long
(12.7 mm) steel pipe conforms to ASTM A53, Types E
and S, Grade B, having a minimum yield strength of
35 ksi (241 MPa) and a minimum tensile strength of
60 ksi (413 MPa). The steel cap plate conforms to ASTM
A572, Grade 50, having a minimum yield strength of
50 ksi (345 MPa) and a minimum tensile strength of
65 ksi (448 MPa). The cap plate assembly finish is either
plain steel or hot-dip galvanized in accordance with ASTM
A123.
3.3.4.4 Threaded Rods and Nuts:
The
3
/
4
-inch-diameter
steel threaded rods conform to ASTM A193, Grade B7,
having a minimum yield strength of 105 ksi (724 MPa)
and a minimum tensile strength of 125 ksi (862 MPa). The
matching
3
/
4
-inch-diameter steel heavy hex nuts conform
to ASTM A563 Grade DH or DH3, or ASTM A194
Grade 2H. The threaded rods and nuts are zinc-coated in
accordance with ASTM B633, with coating classification
Fe/Zn 8.
3.3.5 New Construction Brackets HP288NCB and
HP288NCB8:
3.3.5.1 Plates:
The steel plates conform to ASTM A36,
having a minimum yield strength of 36 ksi (248 MPa) and
a minimum tensile strength of 58 ksi (400 MPa). The plate
finish is either plain steel or hot-dip galvanized in
accordance with ASTM A123.
3.3.5.2 Pipe Sleeves:
The pipe sleeves are steel round
structural tubes that conform to ASTM A513, Type 5,
Drawn Over a Mandrel (DOM), Grade 1026, having a
minimum yield strength of 70 ksi (483 MPa) and a
minimum tensile strength of 80 ksi (552 MPa). The sleeve
finish is either plain steel or hot-dip galvanized in
accordance with ASTM A123.
3.3.5.3 Bolts and Nuts:
The steel bolts and nuts are
those described in Section 3.3.2.2.
4.0 DESIGN AND INSTALLATION
4.1 Design:
4.1.1 General:
Structural calculations (analysis and
design) and drawings, prepared by a registered design
professional, must be approved by the code official for
each project, and must be based on accepted
engineering principles as described in IBC Section
1604.4, and must conform to Section 1810 of the 2012
and 2009 IBC (Section 1808 of the 2006 IBC). The design
method for the steel components is Allowable Strength
Design (ASD), described in IBC Section 1602 and AISC
360 Section B3.4. The structural analysis must consider
all applicable internal forces due to applied loads,
structural eccentricity, and maximum spans between
helical foundations. The result of this analysis, and the
structural capacities, shall be used to select a helical
foundation system.
